Automatic tool retracting power tool

Abstract

The utility model belongs to electric tool technical field, especially point to a kind of automatic tool withdrawal electric tool, comprising: shell;Power supply unit is arranged in shell;Driving unit, driving unit is connected with tool;And control unit, connect the driving unit, for by the driving unit control tool work;Wherein, the control unit includes: MCU;Current monitoring module, for monitoring the current load condition of tool;Start-stop button, for by start-stop button control the driving unit work, to make the tool advance or retreat.The patent is detected by setting the current monitoring module to automatically detect the current load condition of driving unit, and the driving unit full-speed operation is driven by MCU according to the detected current to drive tool, so that the electric tool in the utility model is more flexible to use, and it is convenient for user to use.

Description

Technical Field

[0001] This utility model belongs to the field of power tool technology, and specifically refers to an automatic retractable power tool. Background Technology

[0002] Traditional electric ratchet scissors use a reversing switch to control the opening and closing of the scissors. During the closing process, the motor runs at maximum speed, making it inconvenient for users to control the blade position and adjust the position of the item being cut. Furthermore, after cutting, traditional ratchet scissors require switching the reversing switch to the reverse position and pressing the button again to open, a time-consuming and laborious process involving repeated switching operations. Summary of the Invention

[0003] The purpose of this invention is to provide an automatic retractable power tool that is more convenient to use.

[0004] The purpose of this utility model is achieved as follows:

[0005] Automatic retractable power tools, including:

[0006] case;

[0007] The power supply unit is housed within the casing;

[0008] A drive unit, the drive unit being connected to a cutting tool; and

[0009] A control unit, connected to the drive unit, is used to control the operation of the cutting tool through the drive unit;

[0010] The control unit includes:

[0011] MCU;

[0012] The current monitoring module is used to monitor the current load of the cutting tool.

[0013] The start / stop button is used to control the operation of the drive unit to make the tool move forward or backward.

[0014] The MCU is used to control the drive unit to adjust the forward or backward speed of the tool according to the current load when the tool moves forward or backward.

[0015] Furthermore, the current monitoring module includes a current acquisition circuit, which is used to acquire the load current or voltage of the tool. The MCU adjusts the forward speed or backward speed of the tool according to the acquired load current or load voltage.

[0016] Furthermore, the current acquisition circuit includes:

[0017] Several current sampling branches are used for preliminary sampling of the load current;

[0018] A current-converging branch is used to converge multiple current sampling branches to a single node and convert them into a voltage signal; and

[0019] The operational amplifier branch is used to amplify the voltage signal gathered by the current gathering branch and send it to the MCU.

[0020] Furthermore, the start / stop button is equipped with a direction lever, which is connected to the MCU and used to indicate forward or reverse gear;

[0021] In forward gear, the drive unit is controlled by the start / stop button to move the tool forward;

[0022] In reverse gear, the drive unit is controlled by the start / stop button to make the tool retract.

[0023] Furthermore, the start / stop button is a trigger switch, which is slidably mounted on the housing for pressing to slide; the trigger switch has a start threshold and a control area located after the start threshold;

[0024] When the trigger switch is driven to slide beyond the starting critical point, the control unit drives the tool to move forward or backward according to the direction lever, and controls the forward or backward speed of the tool according to the amount of sliding of the trigger switch in the control area.

[0025] Furthermore, the trigger switch is provided with a reset element that drives it to move in the opposite direction of pressing; when the trigger switch is driven from the control area to the start critical point by the reset element, the MCU controls the tool to reset through the drive unit.

[0026] Furthermore, the drive unit includes a drive motor, which is connected to a reduction gearbox, and a cutting tool is connected through the reduction gearbox.

[0027] The outstanding and beneficial technical effects of this utility model compared to the prior art are:

[0028] The patent automatically detects the current load of the drive unit by setting up the current monitoring module. The MCU automatically drives the drive unit to run at full speed to drive the cutting tool based on the detected current, thereby making the power tool in this patent more flexible and easier for users to use. Attached Figure Description

[0029] Figure 1 This is a structural diagram of a power tool.

[0030] Figure 2This is a schematic diagram of the internal structure of a power tool.

[0031] Figure 3 This is a schematic diagram of the current acquisition circuit.

[0032] The meaning of the labels in the diagram:

[0033] 1. Housing; 2. Power supply unit; 3. Drive unit; 31. Drive motor; 32. Gearbox; 4. Current monitoring module; 41. Several current sampling branches; 42. Current convergence branch; 43. Operational amplifier branch; 5. Start / stop button; 51. Reset component; 6. Tool; 61. Fixed tool; 62. Moving tool; Detailed Implementation

[0034] The present invention will be further described below with reference to specific embodiments:

[0035] An automatic retractable power tool includes a housing 1, a power supply unit 2, a drive unit 3, a cutting tool 6, and a control unit. The automatic retractable power tool in this patent is specifically an electric ratchet scissor. Therefore, the cutting tool 6 specifically includes a fixed blade 61 fixed on the housing 1 and a rotating blade 62. Cutting is achieved by rotating the rotating blade 62.

[0036] For details, please refer to the following: Figure 2 The drive unit 3 includes a drive motor 31 disposed in the housing 1. A reduction gearbox 32 is provided on one side of the drive motor 31. The reduction gearbox 32 is provided with several gears, which are connected to the moving blade 62. When the drive motor 31 is working, the drive motor 31 drives the several gears in the reduction gearbox 32 in sequence to transmit power, and then transmits the power to the moving blade 62, thereby realizing the drive motor 31 driving the moving blade 62.

[0037] Furthermore, the control unit includes an MCU, a current monitoring module 4, and a start / stop button 5. The current monitoring module 4 is used to monitor the current load of the tool 6. The start / stop button 5 is used to control the drive unit 3 to work, so that the tool 6 can move forward or backward. The MCU is used to control the drive unit 3 to adjust the forward speed or backward speed of the tool 6 according to the current load when the tool 6 moves forward or backward.

[0038] like Figure 2 As shown, the power supply unit 2 includes a battery disposed on the bottom of the housing 1, and the MCU is disposed on one side of the battery. The power supply unit 2 supplies power to the MCU and the drive unit 3. The MCU has a built-in program and is equipped with overcurrent protection, undervoltage protection and overheat protection. At the same time, the MCU is connected to the start / stop button 5 and the current monitoring module 4 to control the drive unit 3 to adjust the forward speed or backward speed of the tool 6.

[0039] Specifically, the start / stop button 5 is equipped with a direction lever for indicating the forward or reverse gear. In the forward gear, the start / stop button 5 controls the drive unit 3 to move the tool 6 forward; in the reverse gear, the start / stop button 5 controls the drive unit 3 to move the tool 6 backward. The direction lever is directly mounted on the housing 1, located to one side of the start / stop button 5, and is directly connected to the MCU. The direction lever has two positions, one for forward and one for reverse, respectively. The MCU can directly identify the position of the direction lever and convert it into a corresponding analog signal to execute the corresponding program, thereby controlling the forward or reverse movement of the tool 6.

[0040] Furthermore, the start / stop button 5 is a trigger switch, which is slidably mounted on the housing 1 for pressing to slide. The trigger switch has a start threshold and a control area located after the start threshold. When the trigger switch is driven to slide beyond the start threshold, the control unit drives the tool 6 to move forward or backward according to the direction lever, and controls the forward or backward speed of the tool 6 according to the amount of sliding of the trigger switch in the control area. The trigger switch is provided with a reset element 51 that drives it to move in the opposite direction of pressing; the reset button is generally a spring. Specifically, a contact is provided at the start threshold, and the trigger switch will connect with this contact after sliding a certain distance to form a circuit, thereby controlling the operation of the tool 6 as a switch. The control area is a sliding rheostat device, which is connected to the drive unit 3. When the trigger switch is driven to slide beyond the starting critical point, the control unit controls the tool 6 to move forward or backward according to the direction lever. At the same time, the sliding of the trigger switch causes the resistance of the sliding rheostat in the control area to change, thereby controlling the current in the drive unit 3 to change the rotation of the drive motor 31 in the drive unit 3, thus realizing the adjustment of the forward or backward speed of the tool 6.

[0041] When the trigger switch is driven from the control area to the start critical point, that is, when the trigger switch is reset by the reset member 51, the contact between the trigger switch and the start critical point is disconnected. The MCU can detect this signal of the contact being disconnected through the program, and then control the drive unit 3 to reset the tool 6 according to the signal.

[0042] Furthermore, the current monitoring module 4 includes a current acquisition circuit, which is used to acquire the load current or voltage of the tool 6. The MCU adjusts the forward or backward speed of the tool 6 based on the acquired load current or load voltage. Figure 3As shown, the current acquisition circuit includes several current sampling branches 41, current convergence branches 42, and operational amplifier branches 43. There are two current sampling branches used to acquire the current of the load. The left current sampling branch includes two sets of MOS bridge arms, one upper and one lower. These MOS bridge arms are powered by VBAT and are connected to the high-side drive HO3 and the low-side drive LO3, respectively. Current limiting, voltage division, and filtering are achieved through diodes, resistors, and capacitors within the MOS bridge arms. Similarly, the right current sampling branch also includes two sets of... The MOS bridge arm, with its left and right current sampling branches, is used to connect to the load of the power tool and converges into the current converging branch 42. A sampling resistor R30 is provided at the current converging branch 42. When the current sampled from the current sampling branch passes through the sampling resistor R30, a voltage drop will be generated across the sampling resistor R30 according to Ohm's law, thereby converting the current signal into a voltage signal. The voltage signal is then amplified by the operational amplifier branch 43 and sent to the MCU. The MCU controls the drive unit 3 to control the movement of the tool 6 based on the voltage signal.

[0043] The power tool in this patent operates as follows: In the idle state, the drive unit 3 stops, and the cutter 6 is in its initial state. When the direction lever is in the forward position, the user presses the start / stop button 5, starting the drive unit 3 and driving the cutter 62 forward. At this time, the user can control the speed of the drive motor 31 in the drive unit 3 by controlling the pressing depth of the start / stop button 5, thereby controlling the running speed of the cutter 6. When the cutter 6 begins to cut, the load current of the drive motor 31 increases and is detected by the current monitoring module 4. The MCU controls the drive motor 31 to work at full speed to cut according to the signal detected by the current monitoring module 4. After cutting is completed, the user releases the start / stop button 5, and the MCU controls the drive motor 31 to automatically reverse according to the release of the start / stop button 5, thereby controlling the cutter 6 to reset until the cutter 6 returns to its initial idle state. Similarly, when the direction lever is in the reverse position, the user presses the start / stop button 5 to start the drive unit 3 and drive the cutter 62 backward to perform work. Similarly, the user controls the drive motor 31 to work at full speed according to the load current detected by the current monitoring module 4.

[0044] In summary, this patent automatically detects the current load of the drive unit 3 by setting the current monitoring module 4, and automatically drives the drive unit 3 to run at full speed to drive the tool 62 6 according to the detected current by the MCU, thereby making the power tool in this patent more flexible and convenient for users to use.

[0045] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

[0046] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the content disclosed herein. They are not intended to limit the implementation conditions of this utility model and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by this utility model, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.

[0047] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0048] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

Claims

1. An automatic retractable power tool, characterized in that, include: Shell (1); The power supply unit (2) is installed in the housing (1); Drive unit (3), and the drive unit (3) is connected to the cutting tool (6); as well as The control unit is connected to the drive unit (3) and is used to control the operation of the tool (6) through the drive unit (3); The control unit includes: MCU; The current monitoring module (4) is used to monitor the current load of the cutting tool (6); The start / stop button (5) is used to control the operation of the drive unit (3) so that the tool (6) can move forward or backward. The MCU is used to control the drive unit (3) to adjust the forward speed or backward speed of the tool (6) according to the current load when the tool (6) moves forward or backward.

2. The automatic retracting power tool according to claim 1, characterized in that: The current monitoring module (4) includes a current acquisition circuit, which is used to acquire the load current or voltage of the tool (6). The MCU adjusts the forward speed or backward speed of the tool (6) according to the acquired load current or load voltage.

3. The automatic retracting power tool according to claim 2, characterized in that, The current acquisition circuit includes: Several current sampling branches (41) are used to perform preliminary sampling of the load current; A current-converging branch (42) is used to converge multiple current-sampling branches to the same node and convert them into a voltage signal; and The operational amplifier branch (43) is used to amplify the voltage signal gathered by the current gathering branch (42) and send it to the MCU.

4. The automatic retracting power tool according to claim 1, characterized in that: The start / stop button (5) is equipped with a direction lever, which is connected to the MCU and is used to indicate forward or reverse gear. In forward gear, the drive unit (3) is controlled by the start / stop button (5) to make the tool (6) move forward; In reverse gear, the drive unit (3) is controlled by the start / stop button (5) to make the tool (6) move backward.

5. The automatic retracting power tool according to claim 4, characterized in that: The start / stop button (5) is a trigger switch, which is slidably mounted on the housing (1) for pressing to slide; the trigger switch has a start critical point and a control area located after the start critical point; When the trigger switch is driven to slide beyond the starting critical point, the control unit drives the tool (6) to move forward or backward according to the direction lever, and controls the forward speed or backward speed of the tool (6) according to the amount of sliding of the trigger switch in the control area.

6. The automatic retracting power tool according to claim 5, characterized in that: The trigger switch is provided with a reset member (51) that drives it to move in the opposite direction of pressing; when the trigger switch is driven from the control area to the start critical point by the reset member (51), the MCU controls the tool (6) to reset through the drive unit (3).

7. The automatic retracting power tool according to claim 1, characterized in that: The drive unit (3) includes a drive motor (31), which is connected to a reduction gearbox (32), and a cutting tool (6) is connected through the reduction gearbox (32).

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